201221331 has 4 divisors (see below), whose sum is σ = 268295112. Its totient is φ = 134147552.

The previous prime is 201221327. The next prime is 201221347. The reversal of 201221331 is 133122102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201221331 - 2² = 201221327 is a prime.

It is a super-3 number, since 3×201221331³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 201221331.

It is not an unprimeable number, because it can be changed into a prime (201221351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33536886 + ... + 33536891.

It is an arithmetic number, because the mean of its divisors is an integer number (67073778).

Almost surely, 2^201221331 is an apocalyptic number.

201221331 is a deficient number, since it is larger than the sum of its proper divisors (67073781).

201221331 is an equidigital number, since it uses as much as digits as its factorization.

201221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67073780.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 201221331 is about 14185.2504736434. The cubic root of 201221331 is about 585.9915305497.

Adding to 201221331 its reverse (133122102), we get a palindrome (334343433).

The spelling of 201221331 in words is "two hundred one million, two hundred twenty-one thousand, three hundred thirty-one".